Hey, I need to change the timing belt on my DOHC ZC engine that I have in an '89 crx Si. The problem is that I can't get the nut off the crankshaft pulley to get the timing belt cover off. I tried an impact wrench with 500lbs of torque and that didn't do it, then I borrowed another impact wrench from my work and that didn't get the job done. I don't think it's reverse thread but who knows? ANY ideas would be greatly appreciated. Thanks